marquise-cut diamond tennis bracelet - hanging off black display stand with white background
mm to Carat Stone Size Chart
Marquise-cut

With pointed tips and rounded center, marquise-cut diamonds showcase brilliance and aesthetics. Marquise diamonds are fairly trendy and look sophisticated in an engagement ring. Like oval, emerald, radiant, cushion, and pear shapes, marquise cut stones come in narrow and wide sizes. It has an elongated shape that can make the wearer’s finger appear longer and slender. Our stone sizing chart below shows the standard sizes and matching carat weights for marquise-cut diamonds to help you find your perfect fit.

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Printable Size Chart

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Marquise Diamond Average Carat by Millimeter Conversions

Elegant and rare, marquise cuts hold an air of grandiose extravagance. The slender shape elongates the hand and beautifully carries itself with a romantic flair. | Shop the Kobelli Marquise Collection.
Approx. Millimeter
Approx. Carat Weight
8 x 4
0.5
10.5 x 5.5
1
11.5 x 7
1.25
11.7 x 6
1.5
13 x 6.5
2
14 x 7
2.5
15 x 7.5
3
16 x 8
3.5
16.5 x 8.3
4
17.5 x 6.5
4.5
17.7 x 9
5
Round-shape diamond

Round

Cushion-shape diamond

Cushion

Oval-shape diamond

Oval

Marquise-shape diamond

Marquise
Pear-shape diamond

Pear

Emerald-shape diamond

Emerald

Radiant-shape diamond

Radiant

Asscher-shape diamond

Asscher

FAQ

How much does a listed carat weight vary by?

All diamond weights may vary by 5% unless stated otherwise. One-of-a-kind products will showcase the exact weight of all stones.

Do moissanites weigh the same as diamonds?

Not quite - while the moissanite gemstone is technically slightly lighter in weight due to a lower density, the stones are most commonly marketed by their Diamond Equivalent Weight (DEW) in accordance to the millimeter size of the stone rather than the weight of the stone itself.

All of Kobelli's moissanite products will be listed with the Diamond Equivalent Weights (DEW). This allows for an identical dimensional look if you are to upgrade your existing moissanite center stone for a diamond.

What about other gemstones?

Gemstones, aside from moissanites, will be listed in accordance to either their millimeter size or their carat weight. Every stone type carries its own unique traits for density and depth.